build: remove obsolete rbac.yaml file
build: remove obsolete rbac.yaml file

build/rbac/rbac.yaml should have been removed when we started generating
common.yaml, but it was missed.

Signed-off-by: Blaine Gardner <135b86f2968bdbcc730c10d8ababd343bb675986@redhat.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/rook